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The generator of AM EMFs consists of a battery-driven radiofrequency (RF) EMF generator connected to a 1.5 m long 50 ? coaxial cable, to the other end of which a stainless-steel spoon-shaped mouthpiece is connected via an impedance transformer. The RF source of the device corresponds to a class C amplifier operating at 27.12 MHz. The carrier frequency is AM with a modulation depth of 85±5%, whereas the modulation frequency is generated by a digital direct synthesiser with a resolution of 10-7. The treatment sequence is controlled by a microcontroller (Atmel AT89S8252, Fribourg, Switzerland), that is, duration of session, sequence of modulation frequencies and duration of each sequence can be programmed via PC over a RS232 interface. The RF output is adjusted to 100 mW into a 50 ? load, which results in an emitting power identical to that of the device used for the treatment of insomnia.
Diagram and explanation of cro
Q. For the 4-bit D/A converter of Figure with V ref =-5 V, determine the range of analog output voltage and the smallest increment. Ans. The binary input range is from 0
Q. Working of Equalizer circuit? Equalizer circuit: Equalizers are combination of passive components (capacitors, resistors and so on) that are used to regulate the amplitude a
GIS database: In a nutshell, we could say that the GIS technology integrates general database operations (data query and statistical analysis), along with the unique a
Allocative Efficiency: A neoclassical concept referring to allocation of productive resources (labour, capital, etc.) in a manner that best maximizes well-being (or 'utility') of
Q. Illustrate Hexadecimal Number System? A big difficulty with the binary system is verbosity. To symbolize the value 202 requires eight binary digits. The decimal version n
Assinment
A signal stands for 0110 with positive logic in which low stands for 0 and high stands for 1. If negative logic (in which low stands for 1 and high stands for 0) is used, what digi
Define Flash Analog to Digital Converters? Parallel flash ADCs transform the analog input voltage faster as compared to other types of ADCs. They compare the voltage in parall
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